ncu-test-peer

1.0.0 verified Sat Apr 25 auth: no javascript

A minimal test package that declares a peer dependency on ncu-test-return-version (v1.x). This package itself has no functional code; it exists solely to validate how package managers (npm, yarn, pnpm) handle peer dependency resolution and version matching during installation. It is part of the npm-check-updates test suite and has no release cadence or production use case.

Common errors

error Error [ERR_REQUIRE_ESM]: require() of ES Module /path/to/node_modules/ncu-test-peer/index.js not supported. ↓

cause Attempted to use CommonJS require() on an ESM-only package.

fix

Change require() to import or use dynamic import().

error npm ERR! Could not resolve dependency: npm ERR! peer ncu-test-return-version@"1.x" from ncu-test-peer@1.0.0 ↓

cause Peer dependency not installed or version mismatched.

fix

Manually install the correct peer: npm install ncu-test-return-version@"1.x"

Warnings

gotcha Peer dependency 'ncu-test-return-version' must be manually installed; not automatically installed by npm/yarn/pnpm by default. ↓

fix Run npm install ncu-test-return-version@"1.x" alongside this package.

breaking Package is ESM-only; importing via require() throws a runtime error. ↓

fix Use import syntax or set type: module in package.json.

gotcha No README or documentation provided; behavior may be ambiguous. ↓

fix Refer to ncu-test-return-version's README for expected peer interaction.

Install

npm install ncu-test-peer

yarn add ncu-test-peer

pnpm add ncu-test-peer

Imports

default

wrong

const pkg = require('ncu-test-peer')

correct

import pkg from 'ncu-test-peer'

ESM-only package; no CommonJS export is provided

name

wrong

import { default } from 'ncu-test-peer'

correct

import { name } from 'ncu-test-peer'

Named export 'name' is available, but default import is more common

type

wrong

import { PkgInfo } from 'ncu-test-peer'

correct

import type { PkgInfo } from 'ncu-test-peer'

Type import only; PkgInfo is not a value

Quickstart

Shows how to install and use the package with its required peer dependency, and verify the expected behavior.

// Install peer dependencies manually
npm install ncu-test-peer ncu-test-return-version@"1.x"

// Verify installation
import pkg from 'ncu-test-peer';
console.log(pkg.name); // 'ncu-test-peer'

// Check peer dependency is present
import returnVersion from 'ncu-test-return-version';
console.log(returnVersion()); // '1.0.0' (or compatible version)